Camera settings.
With new versions, as options have been added, most of these settings have moved to the dedicated screens under Settings.
Capture
Configure here if the app should save the photo automatically on capture or open it in the preview (default).
Save
Captured photo will always be saved in the app itself. As an extra option, you can configure if the app should save a copy of either/both original and stamped photo to the photo library.
Version 1.9.4 adds an option to copy original/stamped photo to iCloud drive. Settings > Capture settings > Save to iCloud Files:

Capture quality
Pick from either High, Medium (default) or Low.
Timestamp and Notes overlay
The timestamp format is configured from the dedicated Timestamp format row. Whether the timestamp is visible, and which line contains it, is configured in Notes overlay.
See the complete Timestamp, notes overlay, and file-name dates guide. It also explains the separate automatic-title and file-name date settings.
Option to hide entire bottom comments overlay
Available from version 1.3 and allows you to hide the bottom notes overlay in its entirety. You’ll find this option in the Notes overlay section.
Option to hide entire top location overlay

This option has no effect on whether the location and direction data for the captured photo is stored. Location and direction are always stored; this option only affects whether the top location overlay is shown on the stamped photo.
Hide/show coordinates, altitude and/or direction part in the location overlay
In addition to hiding whole location overlay, you can now pick whether the coordinates, altitude, or direction part of the overlay should be hidden. Settings > Capture settings > Location overlay section:

Color options for overlay texts and background
From version 1.3 , you can customize both background and text colors for the camera overlays:

To configure colors of your choice, open settings and scroll down to the “Overlay colors” section:

If you want to return to either original text or background colors, please use “Reset” buttons in the corresponding setting rows.
As for the color picker, both HSB:

and RGB pickers are available:

Please keep in mind that overlay background has some transparency set - thus the background color will always be a bit “pale” in the color picker.
Thanks to Jerry for his request to add this feature.
Camera grid
Version 1.3 adds a 3x3 grid option. If you need a grid, say YES to it in the Other overlays section.
Custom watermark
Version 1.4 adds the ability to set up a custom watermark. The custom watermark includes text and image, and allows you to define background and text colors:

Configure it via Settings > Watermark. More on watermark setup.